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Scavenging activity. Various concentrations of NAC were added to 1-ml Eppendorf tubes without cells with ethanol as a solvent, and incubated in 0.1 mM 2,2-diphenyl-1-picrylhydrazyl-free radical for 30 min. Data are represented as means ± SEM (n=9, *P<0.01, highly significantly different from the control).
